//*****************************************************************************
//
//! \file socket.c
//! \brief SOCKET APIs Implements file.
//! \details SOCKET APIs like as Berkeley Socket APIs.
//! \version 1.0.3
//! \date 2013/10/21
//! \par  Revision history
//!       <2014/05/01> V1.0.3. Refer to M20140501
//!         1. Implicit type casting -> Explicit type casting.
//!         2. replace 0x01 with PACK_REMAINED in recvfrom()
//!         3. Validation a destination ip in connect() & sendto():
//!            It occurs a fatal error on converting unint32 address if uint8* addr parameter is not aligned by 4byte address.
//!            Copy 4 byte addr value into temporary uint32 variable and then compares it.
//!       <2013/12/20> V1.0.2 Refer to M20131220
//!                    Remove Warning.
//!       <2013/11/04> V1.0.1 2nd Release. Refer to "20131104".
//!                    In sendto(), Add to clear timeout interrupt status (Sn_IR_TIMEOUT)
//!       <2013/10/21> 1st Release
//! \author MidnightCow
//! \copyright
//!
//! Copyright (c)  2013, WIZnet Co., LTD.
//! All rights reserved.
//!
//! Redistribution and use in source and binary forms, with or without
//! modification, are permitted provided that the following conditions
//! are met:
//!
//!     * Redistributions of source code must retain the above copyright
//! notice, this list of conditions and the following disclaimer.
//!     * Redistributions in binary form must reproduce the above copyright
//! notice, this list of conditions and the following disclaimer in the
//! documentation and/or other materials provided with the distribution.
//!     * Neither the name of the <ORGANIZATION> nor the names of its
//! contributors may be used to endorse or promote products derived
//! from this software without specific prior written permission.
//!
//! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//! AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//! IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//! ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
//! LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
//! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
//! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
//! THE POSSIBILITY OF SUCH DAMAGE.
//
//*****************************************************************************
#include "socket.h"

#define SOCK_ANY_PORT_NUM  0xC000;

static uint16_t sock_any_port = SOCK_ANY_PORT_NUM;
static uint16_t sock_io_mode = 0;
static uint16_t sock_is_sending = 0;
static uint16_t sock_remained_size[_WIZCHIP_SOCK_NUM_] = { 0, 0, };
static uint8_t sock_pack_info[_WIZCHIP_SOCK_NUM_] = { 0, };

#if _WIZCHIP_ == 5200
static uint16_t sock_next_rd[_WIZCHIP_SOCK_NUM_] = { 0, };
#endif

#define CHECK_SOCKNUM()   \
    do {                    \
        if (sn > _WIZCHIP_SOCK_NUM_) { return SOCKERR_SOCKNUM; }   \
    } while (0);             \

#define CHECK_SOCKMODE(mode)  \
    do {                     \
        if ((getSn_MR(sn) & 0x0F) != mode) { return SOCKERR_SOCKMODE; }  \
    } while (0);              \

#define CHECK_SOCKINIT()   \
    do {                     \
        if ((getSn_SR(sn) != SOCK_INIT)) { return SOCKERR_SOCKINIT; } \
    } while (0);              \

#define CHECK_SOCKDATA()   \
    do {                     \
        if (len == 0) { return SOCKERR_DATALEN; }   \
    } while (0);              \



int8_t socket(uint8_t sn, uint8_t protocol, uint16_t port, uint8_t flag)
{
    CHECK_SOCKNUM();
    switch (protocol)
    {
    case Sn_MR_TCP:
    case Sn_MR_UDP:
    case Sn_MR_MACRAW:
        break;
#if ( _WIZCHIP_ < 5200 )
    case Sn_MR_IPRAW:
    case Sn_MR_PPPoE:
        break;
#endif
    default:
        return SOCKERR_SOCKMODE;
    }
    if ((flag & 0x06) != 0)
    {
        return SOCKERR_SOCKFLAG;
    }
#if _WIZCHIP_ == 5200
    if (flag & 0x10)
    {
        return SOCKERR_SOCKFLAG;
    }
#endif

    if (flag != 0)
    {
        switch (protocol)
        {
        case Sn_MR_TCP:
            if ((flag & (SF_TCP_NODELAY | SF_IO_NONBLOCK)) == 0)
            {
                return SOCKERR_SOCKFLAG;
            }
            break;
        case Sn_MR_UDP:
            if (flag & SF_IGMP_VER2)
            {
                if ((flag & SF_MULTI_ENABLE) == 0)
                {
                    return SOCKERR_SOCKFLAG;
                }
            }
          #if _WIZCHIP_ == 5500
            if (flag & SF_UNI_BLOCK)
            {
                if ((flag & SF_MULTI_ENABLE) == 0)
                {
                    return SOCKERR_SOCKFLAG;
                }
            }
          #endif
            break;
        default:
            break;
        }
    }

    close(sn);
    setSn_MR(sn, (protocol | (flag & 0xF0)));
    if (!port)
    {
        port = sock_any_port++;
        if (sock_any_port == 0xFFF0)
        {
            sock_any_port = SOCK_ANY_PORT_NUM;
        }
    }
    setSn_PORT(sn, port);
    setSn_CR(sn, Sn_CR_OPEN);
    while (getSn_CR(sn))
    {
        ;
    }
    sock_io_mode |= ((flag & SF_IO_NONBLOCK) << sn);
    sock_is_sending &= ~(1 << sn);
    sock_remained_size[sn] = 0;
    sock_pack_info[sn] = 0;
    while (getSn_SR(sn) == SOCK_CLOSED)
    {
        ;
    }
    return (int8_t)sn;
}

int8_t close(uint8_t sn)
{
    CHECK_SOCKNUM();

    setSn_CR(sn, Sn_CR_CLOSE);
    /* wait to process the command... */
    while (getSn_CR(sn))
    {
        ;
    }

    /* clear all interrupt of the socket. */
    setSn_IR(sn, 0xFF);
    sock_is_sending &= ~(1 << sn);
    sock_remained_size[sn] = 0;
    sock_pack_info[sn] = 0;
    while (getSn_SR(sn) != SOCK_CLOSED)
    {
        ;
    }

    return SOCK_OK;
}

int8_t listen(uint8_t sn)
{
    CHECK_SOCKNUM();
    CHECK_SOCKMODE(Sn_MR_TCP);
    CHECK_SOCKINIT();
    setSn_CR(sn, Sn_CR_LISTEN);
    while (getSn_CR(sn))
    {
        ;
    }
    while (getSn_SR(sn) != SOCK_LISTEN)
    {
        if (getSn_CR(sn) == SOCK_CLOSED)
        {
            close(sn);
            return SOCKERR_SOCKCLOSED;
        }
    }
    return SOCK_OK;
}


int8_t connect(uint8_t sn, uint8_t * addr, uint16_t port)
{
    uint32_t taddr, cnt = 0;

    CHECK_SOCKNUM();
    CHECK_SOCKMODE(Sn_MR_TCP);
    CHECK_SOCKINIT();

    taddr = ((uint32_t)addr[0] & 0x000000FF);
    taddr = (taddr << 8) + ((uint32_t)addr[1] & 0x000000FF);
    taddr = (taddr << 8) + ((uint32_t)addr[2] & 0x000000FF);
    taddr = (taddr << 8) + ((uint32_t)addr[3] & 0x000000FF);
    if ( taddr == 0xFFFFFFFF || taddr == 0)
    {
        return SOCKERR_IPINVALID;
    }

    if (port == 0)
    {
        return SOCKERR_PORTZERO;
    }
    setSn_DIPR(sn, addr);
    setSn_DPORT(sn, port);
#if _WIZCHIP_ == 5200   // for W5200 ARP errata
    setSUBR(0);
#endif
    setSn_CR(sn, Sn_CR_CONNECT);
    while (getSn_CR(sn))
    {
        ;
    }
    if (sock_io_mode & (1 << sn))
    {
        return SOCK_BUSY;
    }
    while (getSn_SR(sn) != SOCK_ESTABLISHED && cnt++ < 1000 * 500)
    {
        if (getSn_IR(sn) & Sn_IR_TIMEOUT)
        {
            setSn_IR(sn, Sn_IR_TIMEOUT);
         #if _WIZCHIP_ == 5200   // for W5200 ARP errata
            setSUBR((uint8_t*)"\x00\x00\x00\x00");
         #endif
            return SOCKERR_TIMEOUT;
        }
    }
#if _WIZCHIP_ == 5200   // for W5200 ARP errata
    setSUBR((uint8_t*)"\x00\x00\x00\x00");
#endif

    return SOCK_OK;
}

int8_t disconnect(uint8_t sn)
{
    CHECK_SOCKNUM();
    CHECK_SOCKMODE(Sn_MR_TCP);
    setSn_CR(sn, Sn_CR_DISCON);
    /* wait to process the command... */
    while (getSn_CR(sn))
    {
        ;
    }
    sock_is_sending &= ~(1 << sn);
    if (sock_io_mode & (1 << sn))
    {
        return SOCK_BUSY;
    }
    // while (getSn_SR(sn) != SOCK_CLOSED)
    {
        if (getSn_IR(sn) & Sn_IR_TIMEOUT)
        {
            close(sn);
            return SOCKERR_TIMEOUT;
        }
    }
    return SOCK_OK;
}

int32_t send(uint8_t sn, uint8_t * buf, uint16_t len)
{
    uint8_t tmp = 0;
    uint16_t freesize = 0;

    CHECK_SOCKNUM();
    CHECK_SOCKMODE(Sn_MR_TCP);
    CHECK_SOCKDATA();
    tmp = getSn_SR(sn);
    if (tmp != SOCK_ESTABLISHED && tmp != SOCK_CLOSE_WAIT)
    {
        return SOCKERR_SOCKSTATUS;
    }
    if ( sock_is_sending & (1 << sn) )
    {
        tmp = getSn_IR(sn);
        if (tmp & Sn_IR_SENDOK)
        {
            setSn_IR(sn, Sn_IR_SENDOK);
         #if _WZICHIP_ == 5200
            if (getSn_TX_RD(sn) != sock_next_rd[sn])
            {
                setSn_CR(sn, Sn_CR_SEND);
                while (getSn_CR(sn))
                {
                    ;
                }
                return SOCKERR_BUSY;
            }
         #endif
            sock_is_sending &= ~(1 << sn);
        }
        else if (tmp & Sn_IR_TIMEOUT)
        {
            close(sn);
            return SOCKERR_TIMEOUT;
        }
        else
        {
            return SOCK_BUSY;
        }
    }
    freesize = getSn_TxMAX(sn);
    if (len > freesize)
    {
        len = freesize;                // check size not to exceed MAX size.
    }
    while (1)
    {
        freesize = getSn_TX_FSR(sn);
        tmp = getSn_SR(sn);
        if ((tmp != SOCK_ESTABLISHED) && (tmp != SOCK_CLOSE_WAIT))
        {
            close(sn);
            return SOCKERR_SOCKSTATUS;
        }
        if ( (sock_io_mode & (1 << sn)) && (len > freesize) )
        {
            return SOCK_BUSY;
        }
        if (len <= freesize)
        {
            break;
        }
    }
    wiz_send_data(sn, buf, len);
   #if _WIZCHIP_ == 5200
    sock_next_rd[sn] = getSn_TX_RD(sn) + len;
   #endif
    setSn_CR(sn, Sn_CR_SEND);
    /* wait to process the command... */
    while (getSn_CR(sn))
    {
        ;
    }
    sock_is_sending |= (1 << sn);
    return len;
}


int32_t recv(uint8_t sn, uint8_t * buf, uint16_t len)
{
    uint8_t tmp = 0;
    uint16_t recvsize = 0;

    CHECK_SOCKNUM();
    CHECK_SOCKMODE(Sn_MR_TCP);
    CHECK_SOCKDATA();

    recvsize = getSn_RxMAX(sn);
    if (recvsize < len)
    {
        len = recvsize;
    }
    while (1)
    {
        recvsize = getSn_RX_RSR(sn);
        tmp = getSn_SR(sn);
        if (tmp != SOCK_ESTABLISHED)
        {
            if (tmp == SOCK_CLOSE_WAIT)
            {
                if (recvsize != 0)
                {
                    break;
                }
                else if (getSn_TX_FSR(sn) == getSn_TxMAX(sn))
                {
                    close(sn);
                    return SOCKERR_SOCKSTATUS;
                }
            }
            else
            {
                close(sn);
                return SOCKERR_SOCKSTATUS;
            }
        }
        if ((sock_io_mode & (1 << sn)) && (recvsize == 0))
        {
            return SOCK_BUSY;
        }
        if (recvsize != 0)
        {
            break;
        }
    }
    ;
    if (recvsize < len)
    {
        len = recvsize;
    }
    wiz_recv_data(sn, buf, len);
    setSn_CR(sn, Sn_CR_RECV);
    while (getSn_CR(sn))
    {
        ;
    }
    return len;
}

int32_t sendto(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port)
{
    uint8_t tmp = 0;
    uint32_t taddr;
    uint16_t freesize = 0;

    CHECK_SOCKNUM();
    switch (getSn_MR(sn) & 0x0F)
    {
    case Sn_MR_UDP:
    case Sn_MR_MACRAW:
        break;
    default:
        return SOCKERR_SOCKMODE;
    }
    CHECK_SOCKDATA();
    //M20140501 : For avoiding fatal error on memory align mismatched
    if (addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] == 0)
    {
        return SOCKERR_IPINVALID;
    }

    taddr = ((uint32_t)addr[0]) & 0x000000FF;
    taddr = (taddr << 8) + ((uint32_t)addr[1] & 0x000000FF);
    taddr = (taddr << 8) + ((uint32_t)addr[2] & 0x000000FF);
    taddr = (taddr << 8) + ((uint32_t)addr[3] & 0x000000FF);


    if (port == 0)
    {
        return SOCKERR_PORTZERO;
    }
    tmp = getSn_SR(sn);
    if (tmp != SOCK_MACRAW && tmp != SOCK_UDP)
    {
        return SOCKERR_SOCKSTATUS;
    }

    setSn_DIPR(sn, addr);
    setSn_DPORT(sn, port);
    freesize = getSn_TxMAX(sn);
    if (len > freesize)
    {
        len = freesize;                // check size not to exceed MAX size.
    }
    while (1)
    {
        freesize = getSn_TX_FSR(sn);
        if (getSn_SR(sn) == SOCK_CLOSED)
        {
            return SOCKERR_SOCKCLOSED;
        }
        if ( (sock_io_mode & (1 << sn)) && (len > freesize) )
        {
            return SOCK_BUSY;
        }
        if (len <= freesize)
        {
            break;
        }
    }
    ;
    wiz_send_data(sn, buf, len);

   #if _WIZCHIP_ == 5200   // for W5200 ARP errata
    setSUBR(0);
   #endif

    setSn_CR(sn, Sn_CR_SEND);
    /* wait to process the command... */
    while (getSn_CR(sn))
    {
        ;
    }
   #if _WIZCHIP_ == 5200   // for W5200 ARP errata
    setSUBR((uint8_t*)"\x00\x00\x00\x00");
   #endif
    while (1)
    {
        tmp = getSn_IR(sn);
        if (tmp & Sn_IR_SENDOK)
        {
            setSn_IR(sn, Sn_IR_SENDOK);
            break;
        }
        //M:20131104
        //else if(tmp & Sn_IR_TIMEOUT) return SOCKERR_TIMEOUT;
        else if (tmp & Sn_IR_TIMEOUT)
        {
            setSn_IR(sn, Sn_IR_TIMEOUT);
            return SOCKERR_TIMEOUT;
        }
        ////////////
    }
    return len;
}

int32_t recvfrom(uint8_t sn, uint8_t* buf, uint16_t len, uint8_t* addr, uint16_t* port)
{
    uint8_t mr;
    uint8_t head[8];
    uint16_t pack_len = 0;

    CHECK_SOCKNUM();
    //CHECK_SOCKMODE(Sn_MR_UDP);
    switch ((mr = getSn_MR(sn)) & 0x0F)
    {
    case Sn_MR_UDP:
    case Sn_MR_MACRAW:
        break;
   #if ( _WIZCHIP_ < 5200 )
    case Sn_MR_IPRAW:
    case Sn_MR_PPPoE:
        break;
   #endif
    default:
        return SOCKERR_SOCKMODE;
    }
    CHECK_SOCKDATA();
    if (sock_remained_size[sn] == 0)
    {
        while (1)
        {
            pack_len = getSn_RX_RSR(sn);
            if (getSn_SR(sn) == SOCK_CLOSED)
            {
                return SOCKERR_SOCKCLOSED;
            }
            if ( (sock_io_mode & (1 << sn)) && (pack_len == 0) )
            {
                return SOCK_BUSY;
            }
            if (pack_len != 0)
            {
                break;
            }
        }
    }
    sock_pack_info[sn] = PACK_COMPLETED;
    switch (mr & 0x07)
    {
    case Sn_MR_UDP:
        if (sock_remained_size[sn] == 0)
        {
            wiz_recv_data(sn, head, 8);
            setSn_CR(sn, Sn_CR_RECV);
            while (getSn_CR(sn))
            {
                ;
            }
            // read peer's IP address, port number & packet length
            addr[0] = head[0];
            addr[1] = head[1];
            addr[2] = head[2];
            addr[3] = head[3];
            *port = head[4];
            *port = (*port << 8) + head[5];
            sock_remained_size[sn] = head[6];
            sock_remained_size[sn] = (sock_remained_size[sn] << 8) + head[7];
            sock_pack_info[sn] = PACK_FIRST;
        }
        if (len < sock_remained_size[sn])
        {
            pack_len = len;
        }
        else
        {
            pack_len = sock_remained_size[sn];
        }
        // Need to packet length check (default 1472)
        wiz_recv_data(sn, buf, pack_len); // data copy.
        break;
    case Sn_MR_MACRAW:
        if (sock_remained_size[sn] == 0)
        {
            wiz_recv_data(sn, head, 2);
            setSn_CR(sn, Sn_CR_RECV);
            while (getSn_CR(sn))
            {
                ;
            }
            // read peer's IP address, port number & packet length
            sock_remained_size[sn] = head[0];
            sock_remained_size[sn] = (sock_remained_size[sn] << 8) + head[1];
            if (sock_remained_size[sn] > 1514)
            {
                close(sn);
                return SOCKFATAL_PACKLEN;
            }
            sock_pack_info[sn] = PACK_FIRST;
        }
        if (len < sock_remained_size[sn])
        {
            pack_len = len;
        }
        else
        {
            pack_len = sock_remained_size[sn];
        }
        wiz_recv_data(sn, buf, pack_len);
        break;
   #if ( _WIZCHIP_ < 5200 )
    case Sn_MR_IPRAW:
        if (sock_remained_size[sn] == 0)
        {
            wiz_recv_data(sn, head, 6);
            setSn_CR(sn, Sn_CR_RECV);
            while (getSn_CR(sn))
            {
                ;
            }
            addr[0] = head[0];
            addr[1] = head[1];
            addr[2] = head[2];
            addr[3] = head[3];
            sock_remained_size[sn] = head[4];
            sock_remaiend_size[sn] = (sock_remained_size[sn] << 8) + head[5];
            sock_pack_info[sn] = PACK_FIRST;
        }
        // Need to packet length check
        if (len < sock_remained_size[sn])
        {
            pack_len = len;
        }
        else
        {
            pack_len = sock_remained_size[sn];
        }
        wiz_recv_data(sn, buf, pack_len); // data copy.
        break;
   #endif
    default:
        wiz_recv_ignore(sn, pack_len);  // data copy.
        sock_remained_size[sn] = pack_len;
        break;
    }
    setSn_CR(sn, Sn_CR_RECV);
    /* wait to process the command... */
    while (getSn_CR(sn))
    {
        ;
    }
    sock_remained_size[sn] -= pack_len;
    //M20140501 : replace 0x01 with PACK_REMAINED
    //if(sock_remained_size[sn] != 0) sock_pack_info[sn] |= 0x01;
    if (sock_remained_size[sn] != 0)
    {
        sock_pack_info[sn] |= PACK_REMAINED;
    }

    return pack_len;
}


int8_t  ctlsocket(uint8_t sn, ctlsock_type cstype, void* arg)
{
    uint8_t tmp = 0;

    CHECK_SOCKNUM();
    switch (cstype)
    {
    case CS_SET_IOMODE:
        tmp = *((uint8_t*)arg);
        if (tmp == SOCK_IO_NONBLOCK)
        {
            sock_io_mode |= (1 << sn);
        }
        else if (tmp == SOCK_IO_BLOCK)
        {
            sock_io_mode &= ~(1 << sn);
        }
        else
        {
            return SOCKERR_ARG;
        }
        break;
    case CS_GET_IOMODE:
        //M20140501 : implict type casting -> explict type casting
        //*((uint8_t*)arg) = (sock_io_mode >> sn) & 0x0001;
        *((uint8_t*)arg) = (uint8_t)((sock_io_mode >> sn) & 0x0001);
        //
        break;
    case CS_GET_MAXTXBUF:
        *((uint16_t*)arg) = getSn_TxMAX(sn);
        break;
    case CS_GET_MAXRXBUF:
        *((uint16_t*)arg) = getSn_RxMAX(sn);
        break;
    case CS_CLR_INTERRUPT:
        if ( (*(uint8_t*)arg) > SIK_ALL)
        {
            return SOCKERR_ARG;
        }
        setSn_IR(sn, *(uint8_t*)arg);
        break;
    case CS_GET_INTERRUPT:
        *((uint8_t*)arg) = getSn_IR(sn);
        break;
    case CS_SET_INTMASK:
        if ( (*(uint8_t*)arg) > SIK_ALL)
        {
            return SOCKERR_ARG;
        }
        setSn_IMR(sn, *(uint8_t*)arg);
        break;
    case CS_GET_INTMASK:
        *((uint8_t*)arg) = getSn_IMR(sn);
    default:
        return SOCKERR_ARG;
    }
    return SOCK_OK;
}

int8_t  setsockopt(uint8_t sn, sockopt_type sotype, void* arg)
{
    // M20131220 : Remove warning
    //uint8_t tmp;
    CHECK_SOCKNUM();
    switch (sotype)
    {
    case SO_TTL:
        setSn_TTL(sn, *(uint8_t*)arg);
        break;
    case SO_TOS:
        setSn_TOS(sn, *(uint8_t*)arg);
        break;
    case SO_MSS:
        setSn_MSSR(sn, *(uint16_t*)arg);
        break;
    case SO_DESTIP:
        setSn_DIPR(sn, (uint8_t*)arg);
        break;
    case SO_DESTPORT:
        setSn_DPORT(sn, *(uint16_t*)arg);
        break;
#if _WIZCHIP_ != 5100
    case SO_KEEPALIVESEND:
        CHECK_SOCKMODE(Sn_MR_TCP);
         #if _WIZCHIP_ > 5200
        if (getSn_KPALVTR(sn) != 0)
        {
            return SOCKERR_SOCKOPT;
        }
         #endif
        setSn_CR(sn, Sn_CR_SEND_KEEP);
        while (getSn_CR(sn) != 0)
        {
            // M20131220
            //if ((tmp = getSn_IR(sn)) & Sn_IR_TIMEOUT)
            if (getSn_IR(sn) & Sn_IR_TIMEOUT)
            {
                setSn_IR(sn, Sn_IR_TIMEOUT);
                return SOCKERR_TIMEOUT;
            }
        }
        break;
   #if _WIZCHIP_ > 5200
    case SO_KEEPALIVEAUTO:
        CHECK_SOCKMODE(Sn_MR_TCP);
        setSn_KPALVTR(sn, *(uint8_t*)arg);
        break;
   #endif
#endif
    default:
        return SOCKERR_ARG;
    }
    return SOCK_OK;
}

int8_t  getsockopt(uint8_t sn, sockopt_type sotype, void* arg)
{
    CHECK_SOCKNUM();
    switch (sotype)
    {
    case SO_FLAG:
        *(uint8_t*)arg = getSn_MR(sn) & 0xF0;
        break;
    case SO_TTL:
        *(uint8_t*)arg = getSn_TTL(sn);
        break;
    case SO_TOS:
        *(uint8_t*)arg = getSn_TOS(sn);
        break;
    case SO_MSS:
        *(uint8_t*)arg = getSn_MSSR(sn);
    case SO_DESTIP:
        getSn_DIPR(sn, (uint8_t*)arg);
        break;
    case SO_DESTPORT:
        *(uint16_t*)arg = getSn_DPORT(sn);
        break;
   #if _WIZCHIP_ > 5200
    case SO_KEEPALIVEAUTO:
        CHECK_SOCKMODE(Sn_MR_TCP);
        *(uint16_t*)arg = getSn_KPALVTR(sn);
        break;
   #endif
    case SO_SENDBUF:
        *(uint16_t*)arg = getSn_TX_FSR(sn);
    case SO_RECVBUF:
        *(uint16_t*)arg = getSn_RX_RSR(sn);
    case SO_STATUS:
        *(uint8_t*)arg = getSn_SR(sn);
        break;
    case SO_REMAINSIZE:
        if (getSn_MR(sn) == Sn_MR_TCP)
        {
            *(uint16_t*)arg = getSn_RX_RSR(sn);
        }
        else
        {
            *(uint16_t*)arg = sock_remained_size[sn];
        }
        break;
    case SO_PACKINFO:
        CHECK_SOCKMODE(Sn_MR_TCP);
        *(uint8_t*)arg = sock_pack_info[sn];
        break;
    default:
        return SOCKERR_SOCKOPT;
    }
    return SOCK_OK;
}
